convulsion
noun
- a violent, involuntary contraction or spasm of the muscles: often used in pl.
- a violent fit of laughter
- any violent disturbance, as a social upheaval or an earthquake
See convulsion in American Heritage Dictionary 4
(kən-vŭlˈshən)
noun- An intense, paroxysmal, involuntary muscular contraction.
- An uncontrolled fit, as of laughter; a paroxysm.
- Violent turmoil: “The market convulsions of the last few weeks have shaken the world” (Felix Rohatyn).
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